Heart attacks and strokes often feel sudden — abrupt disruptions that change lives in an instant. Yet a massive new analysis suggests they are rarely as random as they seem. Drawing on health records from more than nine million adults across South Korea and the United States, researchers found that a striking 99 percent of heart attacks, strokes and related cardiovascular events were preceded by one or more of just four major risk factors.
The study, published in the Journal of the American College of Cardiology, points to high blood pressure, high cholesterol, elevated blood sugar (including diabetes) and tobacco use — past or present — as the dominant factors seen before cardiovascular events. These are not obscure markers; they are well-known, measurable, and — most importantly — modifiable.
High blood pressure stood out as the most common precursor among people who later experienced heart attacks, strokes, or heart failure. In both the Korean and U.S. populations studied, well over 90 percent of individuals with such events had evidence of hypertension beforehand, reinforcing its central role in cardiovascular risk.
Even in groups traditionally seen as at lower risk — such as women under age 60 — more than 95 percent of observed heart attacks and strokes were associated with at least one of these four risk factors. That challenges the commonly held notion that serious heart events can strike without warning or identifiable risk.
Senior study authors and independent experts both emphasise that these findings underscore the power of early detection and risk management. If nearly every major cardiovascular event can be linked to a handful of known factors, then targeted prevention — through lifestyle changes, regular health screening, and appropriate clinical treatment — could make a measurable difference in reducing disease burden.
While genetics and other less well-understood elements can influence individual susceptibility, this research offers a hopeful message: heart attacks and strokes are not simply matters of fate. They are often the culmination of controllable risk factors that can be identified long before they lead to catastrophe.
AI Image Disclaimer “Visuals are created with AI tools and are not real photographs.”
Sources ScienceAlert article summarising the study in the Journal of the American College of Cardiology American College of Cardiology overview of risk factor prevalence before cardiovascular events